import { Request, Response, NextFunction } from 'express';
import { TrustProxyConfig } from './types.js';
export declare function createTrustProxy(config: TrustProxyConfig): (req: Request, res: Response, next: NextFunction) => Promise<void | Response<any, Record<string, any>>>;
/**
 * Pre-configured middleware for strict x402 enforcement
 */
export declare function strictTrustProxy(config: Omit<TrustProxyConfig, 'requireProof'>): (req: Request, res: Response, next: NextFunction) => Promise<void | Response<any, Record<string, any>>>;
/**
 * Pre-configured middleware for optional validation (logging mode)
 */
export declare function optionalTrustProxy(config: Omit<TrustProxyConfig, 'requireProof'>): (req: Request, res: Response, next: NextFunction) => Promise<void | Response<any, Record<string, any>>>;
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